Verykool R620 - Manual (Page 29)

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you can do the operation such as sync, rename, delete and so on.
12.8 Calculator
The calculator performs four operations as addition, subtraction,
multiplication and division. Enter calculator screen, you can input
numbers directly and press navigation key to switch the operation
which you need, then start calculation.
When the calculation of dividing 0 overflows, the result is larger than
999999999999 or less than -999999999999, the mobile phone will
display the wrong hint “E”.
12.9 Currency converter
In this function, if you input the rate and the amount of money in
local, you can get the result of the equivalence money of foreign.
12.10 Health
BMI: in this function, if you input the sex, height, and weight of one
person, you can get the result of BMI.
Menstrual: in this function, please set the phone time to current
time at first (eg.01.01.2011). If you input the last menstrual date
(eg.01.01.2011), and average period (eg.28), you can get the result
of the menstrual: days with red color is the menstrual time, while
days with blue color is good time for pregnancy.
12.11 Stopwatch
In typical stopwatch screen, you can select the split timing or lap
timing and view records that you have saved.
In nWay stopwatch screen, press navigation up/down/left/right keys
to record the time of each direction.
12.12 Ebook reader
This function can be used for reading the files with .txt format which
are stored in the Ebook folder in phone or memory card.
Enter the screen of Ebook file list, activate Options and you can
conduct the following operations.
Open ebook: read the file current selected.
Clean up bookshelf: rearrange the files in the folder.
Global settings: set the font style, font size, scroll by, auto scroll,